I abandoned the use of a wire conduit connected directly to the TG. I use nylon wire ties (a.k.a. tie-wraps) to affix the LED Grow Light Kit's power cord to the nearest goose-neck arm, attach the wire conduit to the backside of the LED fixture using new Velcro strips (double-sided tape would also work here). The cord simply hangs down from the end of the LED fixture. Not the prettiest configuration but it has the added advantage of keeping the Grow Light Kit and TG completely separate pieces... which allows me to remove the Light Kit from the TG without having to mess with the cord. It also keeps the power cord further away from moisture associated with the TG internals.

Hi askmehouse, The LED "bulbs" on the TG LED Grow Light Kit should last many years with proper use. Even so, my alternative power cord routing suggestion allows for the easy separation of the cord from the "bulb". I have updated my response above to include a few photos for your convenience.